source: trunk/libjpeg/cdjpeg.c @ 15

Last change on this file since 15 was 15, checked in by Eugene Romanenko, 15 years ago

needed libs update

File size: 4.7 KB
Line 
1/*
2 * cdjpeg.c
3 *
4 * Copyright (C) 1991-1997, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
7 *
8 * This file contains common support routines used by the IJG application
9 * programs (cjpeg, djpeg, jpegtran).
10 */
11
12#include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
13#include <ctype.h>              /* to declare isupper(), tolower() */
14#ifdef NEED_SIGNAL_CATCHER
15#include <signal.h>             /* to declare signal() */
16#endif
17#ifdef USE_SETMODE
18#include <fcntl.h>              /* to declare setmode()'s parameter macros */
19/* If you have setmode() but not <io.h>, just delete this line: */
20#include <io.h>                 /* to declare setmode() */
21#endif
22
23
24/*
25 * Signal catcher to ensure that temporary files are removed before aborting.
26 * NB: for Amiga Manx C this is actually a global routine named _abort();
27 * we put "#define signal_catcher _abort" in jconfig.h.  Talk about bogus...
28 */
29
30#ifdef NEED_SIGNAL_CATCHER
31
32static j_common_ptr sig_cinfo;
33
34void                            /* must be global for Manx C */
35signal_catcher (int signum)
36{
37  if (sig_cinfo != NULL) {
38    if (sig_cinfo->err != NULL) /* turn off trace output */
39      sig_cinfo->err->trace_level = 0;
40    jpeg_destroy(sig_cinfo);    /* clean up memory allocation & temp files */
41  }
42  exit(EXIT_FAILURE);
43}
44
45
46GLOBAL(void)
47enable_signal_catcher (j_common_ptr cinfo)
48{
49  sig_cinfo = cinfo;
50#ifdef SIGINT                   /* not all systems have SIGINT */
51  signal(SIGINT, signal_catcher);
52#endif
53#ifdef SIGTERM                  /* not all systems have SIGTERM */
54  signal(SIGTERM, signal_catcher);
55#endif
56}
57
58#endif
59
60
61/*
62 * Optional progress monitor: display a percent-done figure on stderr.
63 */
64
65#ifdef PROGRESS_REPORT
66
67METHODDEF(void)
68progress_monitor (j_common_ptr cinfo)
69{
70  cd_progress_ptr prog = (cd_progress_ptr) cinfo->progress;
71  int total_passes = prog->pub.total_passes + prog->total_extra_passes;
72  int percent_done = (int) (prog->pub.pass_counter*100L/prog->pub.pass_limit);
73
74  if (percent_done != prog->percent_done) {
75    prog->percent_done = percent_done;
76    if (total_passes > 1) {
77      fprintf(stderr, "\rPass %d/%d: %3d%% ",
78              prog->pub.completed_passes + prog->completed_extra_passes + 1,
79              total_passes, percent_done);
80    } else {
81      fprintf(stderr, "\r %3d%% ", percent_done);
82    }
83    fflush(stderr);
84  }
85}
86
87
88GLOBAL(void)
89start_progress_monitor (j_common_ptr cinfo, cd_progress_ptr progress)
90{
91  /* Enable progress display, unless trace output is on */
92  if (cinfo->err->trace_level == 0) {
93    progress->pub.progress_monitor = progress_monitor;
94    progress->completed_extra_passes = 0;
95    progress->total_extra_passes = 0;
96    progress->percent_done = -1;
97    cinfo->progress = &progress->pub;
98  }
99}
100
101
102GLOBAL(void)
103end_progress_monitor (j_common_ptr cinfo)
104{
105  /* Clear away progress display */
106  if (cinfo->err->trace_level == 0) {
107    fprintf(stderr, "\r                \r");
108    fflush(stderr);
109  }
110}
111
112#endif
113
114
115/*
116 * Case-insensitive matching of possibly-abbreviated keyword switches.
117 * keyword is the constant keyword (must be lower case already),
118 * minchars is length of minimum legal abbreviation.
119 */
120
121GLOBAL(boolean)
122keymatch (char * arg, const char * keyword, int minchars)
123{
124  register int ca, ck;
125  register int nmatched = 0;
126
127  while ((ca = *arg++) != '\0') {
128    if ((ck = *keyword++) == '\0')
129      return FALSE;             /* arg longer than keyword, no good */
130    if (isupper(ca))            /* force arg to lcase (assume ck is already) */
131      ca = tolower(ca);
132    if (ca != ck)
133      return FALSE;             /* no good */
134    nmatched++;                 /* count matched characters */
135  }
136  /* reached end of argument; fail if it's too short for unique abbrev */
137  if (nmatched < minchars)
138    return FALSE;
139  return TRUE;                  /* A-OK */
140}
141
142
143/*
144 * Routines to establish binary I/O mode for stdin and stdout.
145 * Non-Unix systems often require some hacking to get out of text mode.
146 */
147
148GLOBAL(FILE *)
149read_stdin (void)
150{
151  FILE * input_file = stdin;
152
153#ifdef USE_SETMODE              /* need to hack file mode? */
154  setmode(fileno(stdin), O_BINARY);
155#endif
156#ifdef USE_FDOPEN               /* need to re-open in binary mode? */
157  if ((input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
158    fprintf(stderr, "Cannot reopen stdin\n");
159    exit(EXIT_FAILURE);
160  }
161#endif
162  return input_file;
163}
164
165
166GLOBAL(FILE *)
167write_stdout (void)
168{
169  FILE * output_file = stdout;
170
171#ifdef USE_SETMODE              /* need to hack file mode? */
172  setmode(fileno(stdout), O_BINARY);
173#endif
174#ifdef USE_FDOPEN               /* need to re-open in binary mode? */
175  if ((output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
176    fprintf(stderr, "Cannot reopen stdout\n");
177    exit(EXIT_FAILURE);
178  }
179#endif
180  return output_file;
181}
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